The Lectron - Review (vs SmartCarb)
- Thread starter Jakobi
- Start date
Jakobi
Super Moderator
Negative. Just eye balled it. Dave will likely have all the dimensions recorded though. The carb was noticably longer and a better fit in the GG than the Keihin. Note that I have also removed the reed block spacer and my PWK didn't have any of the plastic adapters on it.
I'm not sure about the choke access with a large tank. As it is you still need to reach in from the LHS, around the front of the carb and then pop the choke up. I only kept it on about 10 seconds.
I have a 45 degree cable in it now. Ideally you'd trim back some of the sleeve on the cable so allow it to sit in lower and give a greater range of adjustment. I'll snap you a photo or two this afternoon. I'm also planning on trimming my space cable back some.
I'm not sure about the choke access with a large tank. As it is you still need to reach in from the LHS, around the front of the carb and then pop the choke up. I only kept it on about 10 seconds.
I have a 45 degree cable in it now. Ideally you'd trim back some of the sleeve on the cable so allow it to sit in lower and give a greater range of adjustment. I'll snap you a photo or two this afternoon. I'm also planning on trimming my space cable back some.
Fred1956
New member
If I remember the Lectron has an option for a choke lever, presumably to move the actuator to the left side
singletracker
New member
Here are the dimensions that I measured when I got my Lectron.
Stock Dimensions:
Airbox bell: 63mm
engine side bell: 46mm
length: 90.5mm
Throttle cable housing I.D.: 5.98mm
Lectron Dimensions:
Airbox bell: 60.19mm
Engine side bell: 46.0mm
Length: 97.2mm
Throttle Cable housing I.D. 6.15mm
Stock Dimensions:
Airbox bell: 63mm
engine side bell: 46mm
length: 90.5mm
Throttle cable housing I.D.: 5.98mm
Lectron Dimensions:
Airbox bell: 60.19mm
Engine side bell: 46.0mm
Length: 97.2mm
Throttle Cable housing I.D. 6.15mm
singletracker
New member
Jakobi; I have a 45 degree cable in it now. Ideally you'd trim back some of the sleeve on the cable so allow it to sit in lower and give a greater range of adjustment. [/QUOTE said:
adv rider
Platinum Level Site Supporter
lectron
Are their newer and older versions of lectron's ? Is it a 39 mm that you are trying out? I see one for sale and wondering if its the same thing you are testing.
What do these usually go for? I contacted the seller to find out more-was running it on cr500
Are their newer and older versions of lectron's ? Is it a 39 mm that you are trying out? I see one for sale and wondering if its the same thing you are testing.
What do these usually go for? I contacted the seller to find out more-was running it on cr500
Jakobi
Super Moderator
No idea if the old lectrons and the new are the same. That would be a question for Lectron. Perhaps Dave will know. In regards to this its not something I have researched at all. I was just asked if I'd like to have a play with it so naturally I was interested 
The one in my bike is a 38mm.
Today I went about trimming up my spare cable. I took about 15mm off the end that attaches to the throttle. You could have probably taken it from the other end easier, but I'm not sure if it would have had room to still slide into the carb cap properly (ie cut back too far towards the bend). I'm happier with the fit now but still need to tie wire both ends before going out for a real single track mission. This cable was a motion pro std cable which is a few inches longer than the stock GG. No more issues with the cable hanging up when turning the bars.
I only ran one test today and that was running the rod 1/4 turn leaner than before. As Dave said, originally it was 50.5mm (from bottom of slide to end of metering rod). Coming out a quarter turn too it to 50.75mm and was enough to take the bike from near perfect to too lean at idle. The bike would consistently hang idle and bog when cracking the throttle. Previously it only very slightly hesitated when cold, and ran like an absolute champ when up to temp. I also noticed a reduction in torque in the bottom end. The mid range felt good and much more like my previous Keihin setup. Crisper and snappier, but due to being no pilot jet I can't just fatten up the idle without richening the mid as well.
I might try and go a quarter turn richer at some point, but I think any gains in bottom end will come at the expense of fuel economy and snap in the mid range, so for now I'm going to take it on a ride and see how it performs over a day.
I am still yet to touch the boost jet/power jet. I checked its position as it was sent, and it came in at exactly 3/4's of a turn out from closed. I have no idea what sized jet is in it.
The one in my bike is a 38mm. Today I went about trimming up my spare cable. I took about 15mm off the end that attaches to the throttle. You could have probably taken it from the other end easier, but I'm not sure if it would have had room to still slide into the carb cap properly (ie cut back too far towards the bend). I'm happier with the fit now but still need to tie wire both ends before going out for a real single track mission. This cable was a motion pro std cable which is a few inches longer than the stock GG. No more issues with the cable hanging up when turning the bars.
I only ran one test today and that was running the rod 1/4 turn leaner than before. As Dave said, originally it was 50.5mm (from bottom of slide to end of metering rod). Coming out a quarter turn too it to 50.75mm and was enough to take the bike from near perfect to too lean at idle. The bike would consistently hang idle and bog when cracking the throttle. Previously it only very slightly hesitated when cold, and ran like an absolute champ when up to temp. I also noticed a reduction in torque in the bottom end. The mid range felt good and much more like my previous Keihin setup. Crisper and snappier, but due to being no pilot jet I can't just fatten up the idle without richening the mid as well.
I might try and go a quarter turn richer at some point, but I think any gains in bottom end will come at the expense of fuel economy and snap in the mid range, so for now I'm going to take it on a ride and see how it performs over a day.
I am still yet to touch the boost jet/power jet. I checked its position as it was sent, and it came in at exactly 3/4's of a turn out from closed. I have no idea what sized jet is in it.
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Thanks for the measurements singletracker. Jake, maybe you could soft solder a ring on the tube (10mm up?) and safety wire from that to the brass adjuster.
The older lecterns do differ from the newer ones, not 100% sure if the differences but I do know that the needles are not interchangeable between the old and new and the old ones only allow needle adjustments of 1 full turn whe the new knew will do 1/4 turn increments. The new ones are definitely a better carb for the sort of riding we all do.
With the dimensions it should be possible to reduce the length by ~5mm with some minor machining to make it an easier fit. Will look into it if it becomes an issue.
Jake if you want I'll send a 3-2 needle to try... It'll have a richer bottom end and same mid range compared to the current 3-1 needle so you'll be able to drop it further to lean out the mid but avoid the hanging idle.
With the dimensions it should be possible to reduce the length by ~5mm with some minor machining to make it an easier fit. Will look into it if it becomes an issue.
Jake if you want I'll send a 3-2 needle to try... It'll have a richer bottom end and same mid range compared to the current 3-1 needle so you'll be able to drop it further to lean out the mid but avoid the hanging idle.
Jakobi
Super Moderator
That might be an option Dave. I'm happy to experiment with the carb while I have it here. Perhaps you could slip the needle in with that other order we've been discussing. In relation to changing the needles out, whats the process? Do you just unthread it all the way and then thread the new one in? Any issues with wear on the plastic thread over time?
Hopefully I'll know more after a decent ride on it too. With the top end jet whats the technical term for it, and what sized jet did you have in there? Will I need to adjust this if changing needles? Currently it was only set at 3/4's of a turn out from fully seated. I'm yet to make any adjustments to it.
singletracker
New member
I checked my power jet setting to give you something to go by. It is currently at 3/4 of a turn out from all the way in. When I got it from Lectron it was 1.75 turns out and had more top end than it did with the PWK, but it is even better now. Temps today were 52F and it ran great.
Jakobi
Super Moderator
I'm going to have a play with the powerjet and see how it responds to coming out half a turn richer. Felt like it went a bit flat in top gear WOT. Not bogging but I think it could use a little more fuel.
Does anyone know if there is any circuit overlap on these carbs? If I go to a larger powerjet will it still have some effect over the bottom and mid as well?
After putting 30kms on it today, just a little run down a wooped and washed out track with a few nice rocky hills I'm pretty happy with it. As happy as I was with my previous setup. They are both very similar actually, and I think what am I trying to achieve is to get the Lectron to feel like the AS2 setup did. Maybe I'm mad?
Having a glimpse into the tank I've used about 3L over 30kms so thats pretty standard usage, and I was pretty heavily into the throttle. The bike loves to throw the front wheel around and begs to keep taking gears. I had the drift HD setup, but got home and for some reason it didn't record. Pretty bummed with that, but oh well. I think the bike could use a fraction more fuel right off the bottom too (just for added torque), but it definitely doesn't need anymore through the mid. Maybe a touch more up top.
Does anyone know if there is any circuit overlap on these carbs? If I go to a larger powerjet will it still have some effect over the bottom and mid as well?
After putting 30kms on it today, just a little run down a wooped and washed out track with a few nice rocky hills I'm pretty happy with it. As happy as I was with my previous setup. They are both very similar actually, and I think what am I trying to achieve is to get the Lectron to feel like the AS2 setup did. Maybe I'm mad?
Having a glimpse into the tank I've used about 3L over 30kms so thats pretty standard usage, and I was pretty heavily into the throttle. The bike loves to throw the front wheel around and begs to keep taking gears. I had the drift HD setup, but got home and for some reason it didn't record. Pretty bummed with that, but oh well. I think the bike could use a fraction more fuel right off the bottom too (just for added torque), but it definitely doesn't need anymore through the mid. Maybe a touch more up top.
Jakobi
Super Moderator
Thanks Dave.
Today I put a solid 70kms on the bike with mixed terrain from tropical rainforest, humid, damp, exposed roots and ruts galore to dry sandy, rocky goat tracks, and all tied together with some flowing woopee trails. A fairly decent mix to get a grasp on it.
It feels to be a bit beefier in the mid range than my previous setup was. A bit more grunt just below band, which has also had the effect of smoothing the transition. Burbling off the bottom is very similar, however the Lectron feels it lacks punch right off idle. I'm going to go richer and see if I can get a bit more right off the bottom. The bike isn't bogging or missing, but just doesn't feel as punchy as it could be. Once up in the revs it runs like a champ!
Before I left I brought the power jet out another 1/8th of a turn which feels better than it was. After the first section of single track pulling a gear high and loading the engine up I had the old hanging idle again so went a quater of a turn richer on the rod. No more hanging idle for the rest of the day. It would smoke a bit in the slow going, but so would my AS2 with current jetting. I'm hoping that I can get another 1/4 to 1/2 a turn on the metering rod picking up some more torque without introducing too much burbling, or taking too much snap away from the midrange.
Fuel consmpution I have not checked yet but visually looking in the tank I can see a good quanitity floating around. I'm guessing I would have been on target and used about 6-7L for the 70kms of riding. I'll follow this up when I refill the tank.
Got some video footage too. Give me a week and I'll be able to post some up. Cheers
Today I put a solid 70kms on the bike with mixed terrain from tropical rainforest, humid, damp, exposed roots and ruts galore to dry sandy, rocky goat tracks, and all tied together with some flowing woopee trails. A fairly decent mix to get a grasp on it.
It feels to be a bit beefier in the mid range than my previous setup was. A bit more grunt just below band, which has also had the effect of smoothing the transition. Burbling off the bottom is very similar, however the Lectron feels it lacks punch right off idle. I'm going to go richer and see if I can get a bit more right off the bottom. The bike isn't bogging or missing, but just doesn't feel as punchy as it could be. Once up in the revs it runs like a champ!
Before I left I brought the power jet out another 1/8th of a turn which feels better than it was. After the first section of single track pulling a gear high and loading the engine up I had the old hanging idle again so went a quater of a turn richer on the rod. No more hanging idle for the rest of the day. It would smoke a bit in the slow going, but so would my AS2 with current jetting. I'm hoping that I can get another 1/4 to 1/2 a turn on the metering rod picking up some more torque without introducing too much burbling, or taking too much snap away from the midrange.
Fuel consmpution I have not checked yet but visually looking in the tank I can see a good quanitity floating around. I'm guessing I would have been on target and used about 6-7L for the 70kms of riding. I'll follow this up when I refill the tank.
Got some video footage too. Give me a week and I'll be able to post some up. Cheers
twowheels
New member
Come on Jake, some of us have short attention sp ... hey wait, there's a squirrel
Looking forward to the review, but not what it's going to do the race budget
Nice work.
Sent you the 3-2 needle today express post, hopefully be there in a couple of days. Will be interested to see if it sorts the low rpm running.
Sent you the 3-2 needle today express post, hopefully be there in a couple of days. Will be interested to see if it sorts the low rpm running.
Jakobi
Super Moderator
Cheers Dave
What is the suggested starting position? Would you place it in at the same level as it is? Or a bit leaner? Also anything to be aware of when changing it out? I don't want to strip the plastic threads out or the likes.
Jakobi
Super Moderator
Cast SC is only a few weeks away now!
Very true.. and mine too! It'll be equally as interesting to see how it compares to the Lectron. For the jump in price I'm hoping its a touch better again. Maybe the external rod adjuster will justify the price hike. I still question the whole one metering rod for all applications that we have been promised, but time will tell.
